Efficient Ion-Pair Extraction of Potassium Chloride from Aqueous Phase into Nitrobenzene Containing Dicyclohexyl-18-crown-6 as Cation Binder and Diphenylthiourea as Anion Binder.

MURAD Mihab M., HAYASHITA Takashi, SHIGEMORI Kazuki, NISHIZAWA Seiichi, TERAMAE Norio

doi:10.2116/analsci.15.1185

Efficient Ion-Pair Extraction of Potassium Chloride from Aqueous Phase into Nitrobenzene Containing Dicyclohexyl-18-crown-6 as Cation Binder and Diphenylthiourea as Anion Binder.

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MURAD Mihab M.

Department of Chemistry, Graduate School of Science, Tohoku University
HAYASHITA Takashi

Department of Chemistry, Graduate School of Science, Tohoku University
SHIGEMORI Kazuki

Department of Chemistry, Graduate School of Science, Tohoku University
NISHIZAWA Seiichi

Department of Chemistry, Graduate School of Science, Tohoku University
TERAMAE Norio

Department of Chemistry, Graduate School of Science, Tohoku University

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In combination with an ion pair extraction of potassium salts by dicyclohexyl-18-crown-6 (DC18C6), extraction behavior of anions with a diphenylthiourea (DPTU) from aqueous phase into nitrobenzene has been examined. The extraction selectivity of potassium salts follows a Hofmeister series: NO₃^->Br^->Cl^->OAc^-. The extractability of KCl by DC18C6 is significantly enhanced upon the addition of DPTU in organic solution. The slope analysis of the extraction equilibrium reveals a 1:1 complex formation between DPTU and Cl^-. The hydrogen-bonding interaction of DPTU with Cl^- is confirmed by the ¹H NMR analysis in d₅-nitrobenzene. For qualitative evaluation, solid-liquid extraction of KCl into d₅- nitrobenzene containing DPTU and DC18C6 has been examined by ¹H NMR analysis. Similar to the liquid-liquid extraction, an efficient synergistic effect of DPTU for the extraction of KCl is clarified.